<?php
/*
 * File: SimpleImage.php
 * Author: Simon Jarvis
 * Copyright: 2006 Simon Jarvis
 * Date: 08/11/06
 * Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details:
 * http://www.gnu.org/licenses/gpl.html
 *
 */

class SimpleImage {
	 
	var $image;
	var $image_type;
	
	function getThumbPathWidthHeight($filename,$width=0,$height=0){
		$filenameParts = explode(".",$filename);
		$filenamestr = "";
		for($i = 0; $i < count($filenameParts)-1; $i++){
			$filenamestr .= $filenameParts[$i];
		}
		if(!is_file("./files/uploads/thumbs/".$filenamestr."-$width-$height.".$filenameParts[count($filenameParts)-1])){
			$this->load(base_url()."files/uploads/".rawurlencode($filename));
			if($width > 0 && $height > 0){
				$this->resize($width,$height);
			}elseif($width < 1){
				$this->resizeToHeight($height);
			}elseif($height < 1){
				$this->resizeToWidth($width);
			}
			$this->save("./files/uploads/thumbs/".$filenamestr."-$width-$height.".$filenameParts[count($filenameParts)-1]);
		}
		return base_url()."files/uploads/thumbs/".$filenamestr."-$width-$height.".$filenameParts[count($filenameParts)-1];
	}
	
	
	function getThumbPathScale($filename,$scale){
		$filenameParts = explode(".",$filename);
		$filenamestr = "";
		for($i = 0; $i < count($filenameParts)-1; $i++){
			$filenamestr .= $filenameParts[$i];
		}
		if(!is_file("./files/uploads/thumbs/".$filenamestr."-$scale.".$filenameParts[count($filenameParts)-1])){
			$this->load(base_url()."files/uploads/".$filename);
			$this->scale($scale);
			$this->save("./files/uploads/thumbs/".$filenamestr."-$scale.".$filenameParts[count($filenameParts)-1]);
		}
		return base_url()."files/uploads/thumbs/".$filenamestr."-$scale.".$filenameParts[count($filenameParts)-1];
	}
	
	
	function load($filename) {
		$image_info = getimagesize($filename);
		$this->image_type = $image_info[2];
		if( $this->image_type == IMAGETYPE_JPEG ) {
			$this->image = imagecreatefromjpeg($filename);
		} elseif( $this->image_type == IMAGETYPE_GIF ) {
			$this->image = imagecreatefromgif($filename);
		} elseif( $this->image_type == IMAGETYPE_PNG ) {
			$this->image = imagecreatefrompng($filename);
		}
	}
	function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
		if( $image_type == IMAGETYPE_JPEG ) {
			imagejpeg($this->image,$filename,$compression);
		} elseif( $image_type == IMAGETYPE_GIF ) {
			imagegif($this->image,$filename);
		} elseif( $image_type == IMAGETYPE_PNG ) {
			imagepng($this->image,$filename);
		}
		if( $permissions != null) {
			chmod($filename,$permissions);
		}
	}
	function output($image_type=IMAGETYPE_JPEG) {
		if( $image_type == IMAGETYPE_JPEG ) {
			imagejpeg($this->image);
		} elseif( $image_type == IMAGETYPE_GIF ) {
			imagegif($this->image);
		} elseif( $image_type == IMAGETYPE_PNG ) {
			imagepng($this->image);
		}
	}
	function getWidth() {
		return imagesx($this->image);
	}
	function getHeight() {
		return imagesy($this->image);
	}
	function resizeToHeight($height) {
		$ratio = $height / $this->getHeight();
		$width = $this->getWidth() * $ratio;
		$this->resize($width,$height);
	}
	function resizeToWidth($width) {
		$ratio = $width / $this->getWidth();
		$height = $this->getheight() * $ratio;
		$this->resize($width,$height);
	}
	function scale($scale) {
		$width = $this->getWidth() * $scale/100;
		$height = $this->getheight() * $scale/100;
		$this->resize($width,$height);
	}
	function resize($width,$height) {
		$new_image = imagecreatetruecolor($width, $height);
		imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
		$this->image = $new_image;
	}
}
